usr.sbin/fstyp/befs.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2021 Miguel Gocobachi
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #include <stdint.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #include "fstyp.h"
  37
  38 #define B_OS_NAME_LENGTH        32
  39 #define BEFS_BLOCK_OFFSET       512
  40 #define BEFS_SUPER_BLOCK_MAGIC1 0x42465331
  41
  42 struct disk_super_block {
  43     char        name[B_OS_NAME_LENGTH];
  44     int32_t     magic1;
  45 };
  46
  47 int
  48 fstyp_befs(FILE *fp, char *label, size_t size, const char *devpath)
  49 {
  50         struct disk_super_block *volume;
  51
  52         volume = read_buf(fp, BEFS_BLOCK_OFFSET, sizeof(*volume));
  53
  54         if (volume == NULL) {
  55                 return (1);
  56         }
  57
  58         if (volume->magic1 == BEFS_SUPER_BLOCK_MAGIC1) {
  59                 strlcpy(label, volume->name, size);
  60                 free(volume);
  61
  62                 return (0);
  63         }
  64
  65         free(volume);
  66
  67         return (1);
  68 }